① Support rod adapter 0-40mm ② Head ring 300mm ③ Support rod 8mm ④ Flexible shaft retractor 350mm ⑤ The length of the ordinary cerebral platen is 100mm and the width is 6, 8, 10 and 12mm ⑥ Conical brain pressure plate 10X3mm, 12X5mm, 14X6mm ⑦ micro ordinary brain pressure plate length 100mm wide 3, 5mm Conical brain pressure plate length 100mm 14X6mm, 10X4mm